lec14 - Electric lighting Evolution of lighting Ancient...

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Unformatted text preview: Electric lighting Evolution of lighting Ancient times: fire, torches, candles Greeks and Romans: bronze and pottery lamps with (olive) oil Middle Ages: oil lamps (with reflectors) 1784: hollow wick, glass cylinder (Argand, Switzerland) end XVIII th : kerosene 1800s: gas street lamps (London) 1879: Edisons patent on incandescent lamps XX th : mercury vapor lamps in 30 ies , fluorescent lamps in 1939, tungsten-halogen lamps in 50 ies , metal halide + high pressure sodium in 60 ies , electrodeless lamps in 90 ies Electric lighting Light emission Incandescence Filament lamps Pyroluminescence Candoluminescence Carbon arc radiation Luminescence Photoluminescence (fluo/phosphorescent lamps, Laser) Electroluminescence (LEDs, cathodoluminescence) Other luminescence phenomena Electric lighting Lamp types Incandescent (classic, halogen) Discharge (fluorescent tubes) Electrodeless (induction-based) 8 Natural light 7 Low pressure sodium 6 High pressure sodium 5 Mercury vapor 4 Fluorescence 3 Metal halide 2 Halogen 1 Classic incandescent 200 160 180 140 120 100 80 60 40 20 } } } 1 3 4 5 6 7 8 Incandescent lamps Discharge lamps Natural light lm/W Image by MIT OCW. Electric lighting Incandescent lamps (color T = 2500 K) Classic incandescence 15 to 500 W 6 to 17 lm/W Electric lighting...
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lec14 - Electric lighting Evolution of lighting Ancient...

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